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Byju's Answer

Standard XII

Biology

Stomata: Opening and Closing

Select the co...

Question

Select the correct events leading to the stomatal opening.
(a) The decline in guard cell solutes.
(b) Lowering of osmotic potential of guard cells.
(c) Rise in K ions in guard cells.
(d) Movement of water from neighboring cells into guard cells.
(e) Guard cells become flaccid.

a, e

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b, c, d

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a, c, d

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b, d, e

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Solution

The correct option is B b, c, d
The stomatal opening follows when solutes from near epidermal and mesophyll cell enter the guard cell lowering its osmotic potential and water potential. Also rising in K ions in guard cell allows movement of water into the guard cell from neighbouring cells and makes the guard cell swollen due to water accumulation which results in the opening of stomata.
So, the answer is, "b,c,d".

Suggest Corrections

Similar questions

Q. Select the correct events leading to opening of the stomata.
I. Decline is guard cells solutes.
II. Lowering of osmotic potential of guard cells.
III. Rise in potassium levels in guard cells.
IV. Movement of water from neighbouring cells into guard cells.
V. Guard cells becoming flaccid.
Select the correct answer using the codes given below.

Q. Arrange the events of the opening of stomata in the correct sequence and choose the correct option accordingly.

I. Lowering of osmotic potential of guard cells.
II. Decline in guard cell solute.
III. Rise of potassium ion level in guard cells.
IV. Guard cells absorb water from neighboring epidermal cells.
V. Guard cells become flaccid.

"Select the correct events leading to the opening of stomata:

I)decline in guard cell solutes

II) lowering of osmotic potential of guard cell

III) rise in potassium levels in guard cells

IV)movement of water from neighbouring cells to guard cells

V) guard cells becoming flaccid "

The answer to this question is given as II, III and IV

My doubt is why can it not be I, III and IV.

Because when there is a decline in guard cell solutes, it infers that there has been a movement of water from neighbouring cells to guard cells right?

Q. According to

H^{+} - K^{+}

exchange pump mechanism of stomatal movement
I.

K^{+}

ions accumulate in guard cells during the day.
II.

H^{+}

ions are pumped out from guard cells and

K^{+}

ions are pumped into guard cells.
III. Water potential of guard cells decreases with the accumulation of

K^{+}

ions together with

C l^{-}

and organic acid ions.
IV. Water enters into guard cells from epidermal and mesophyll cells due to decreased water potential of guard cells.

Q. Identify the correct statements and find out the correct combination?
1. Accumulation of

K^{+}

ions in guard cell does not require energy.
2. A high pH favors stomatal opening.
3. Movement of chloride ions into guard cells is in response to electrical differential created by

K^{+}

ions.
4. With the entry of several

K^{+}

ions and chloride ions, the water potential of guard cells increases.

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Select the correct events leading to the stomatal opening.(a) The decline in guard cell solutes.(b) Lowering of osmotic potential of guard cells. (c) Rise in K ions in guard cells.(d) Movement of water from neighboring cells into guard cells.(e) Guard cells become flaccid.

Select the correct events leading to the stomatal opening.
(a) The decline in guard cell solutes.
(b) Lowering of osmotic potential of guard cells.
(c) Rise in K ions in guard cells.
(d) Movement of water from neighboring cells into guard cells.
(e) Guard cells become flaccid.